"State of Love and Trust"

Derek begins his role as interim chief. Teddy refuses to place Cristina on her service. Arizona tests Alex out in pediatrics. Mark refuses to speak to Lexie.

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"I Like You So Much Better When You're Naked"

Derek confronts Richard for the sake of his friend and the hospital. Izzie returns, hoping to reconcile with Alex. Tensions run high between Teddy, Cristina and Owen.

Desperate to help his pregnant daughter, Mark follows Addison to Oceanside. Derek's suspicions are raised when the Chief recruits Meredith to assist with a high profile operation.

"Holidaze"

Thanksgiving, Christmas and New Year's pass. Miranda is visited by her father. Mark and Lexie cope with the arrival of a woman from his past. Thatcher questions the Chief's behavior.

"New History"

Izzie returns to Seattle Grace with an important figure from her past. Stress takes a toll on Richard. Owen recruits a fellow Iraq war vet as the a cardiothoracic surgeon.

"Invest In Love"

All eyes are on Arizona to help a patient with an enormous donation to spare. Cristina tries to test Owen's boundaries, and Alex is losing it over Izzie.

"Give Peace A Chance"

Derek must help the most unlikeliest of all; the hospital lab-tech, Isaac, when it turns out that he has an inoperable tumor surrounding his spine. McDreamy also questions Richard's authority.

"I Saw What I Saw"

A burn victim's death in a chaotic ER prompts the Chief and the board to find who is responsible, as all the Mercy West and Seattle Grace residents scramble to save their jobs.

"Invasion"

Newly-merged Seattle Grace and Mercy West residents vie for surgeries and their careers, while Arizona stands by Callie when her father employs a priest to convince her to date men, and Izzie experiences the brunt of her new competition.

"Tainted Obligation"

When Meredith and Lexie Grey's father, Thatcher, returns to the hospital with a failed liver, it's up to Meredith to save his life. That won't be easy for myriad reasons.

Grey's Anatomy Quotes

Life is too precious to waste doing anything less than what makes us happy.

Miranda

MEREDITH: "You don't get to call me a whore. When I met you, I thought I had found the person that I was going to spend the rest of my life with. I was done! All the boys and all the bars and all the obvious daddy issues, who cares? I was done. You left me. You chose Addison. I'm all glued back together now. I make no apologies for how I chose to repair what you broke. You don't get to call me a whore."
DEREK: "This thing with us is finished. It's over."
MEREDITH: "Finally."
DEREK: "Yeah, it's done."
MEREDITH: "It is done."